#include "junix.h"
using namespace std;

class Null{};
class Null2:public Null{};
class Null3:public Null2{};

int main(int argc, char **argv)
{
	cout<<"sizeof(Null):"<<sizeof(Null)<<endl;
	cout<<"sizeof(Null2):"<<sizeof(Null2)<<endl;
	cout<<"sizeof(Null3):"<<sizeof(Null3)<<endl;
	return 0;
}
